public virtual string formatDafYomiBavli(Daf daf)
{
if (hebrewFormat)
{
return(daf.Masechta + " " + formatHebrewNumber(daf.Page));
}
else
{
return(daf.MasechtaTransliterated + " " + daf.Page);
}
}
/// <summary>
/// Returns the <a href="http://en.wikipedia.org/wiki/Daf_yomi">Daf Yomi</a> <a
/// href="http://en.wikipedia.org/wiki/Talmud">Bavli</a> <seealso cref="Daf"/> for a given date. The first Daf Yomi cycle
/// started on Rosh Hashana 5684 (September 11, 1923) and calculations prior to this date will result in an
/// IllegalArgumentException thrown. For historical calculations (supported by this method), it is important to note
/// that a change in length of the cycle was instituted starting in the eighth Daf Yomi cycle beginning on June 24,
/// 1975. The Daf Yomi Bavli cycle has a single masechta of the Talmud Yerushalmi - Shekalim as part of the cycle.
/// Unlike the Bavli where the number of daf per masechta was standardized since the original <a
/// href="http://en.wikipedia.org/wiki/Daniel_Bomberg">Bomberg Edition</a> published from 1520 - 1523, there is no
/// uniform page length in the Yerushalmi. The early cycles had the Yerushalmi Shekalim length of 13 days following
/// the <a href="http://en.wikipedia.org/wiki/Zhytomyr">Zhytomyr</a> Shas used by <a
/// href="http://en.wikipedia.org/wiki/Meir_Shapiro">Rabbi Meir Shapiro</a>. With the start of the eighth Daf Yomi
/// cycle beginning on June 24, 1975 the length of the Yerushalmi shekalim was changed from 13 to 22 daf to follow
/// the Vilna Shas that is in common use today.
/// </summary>
/// <param name="calendar">
/// the calendar date for calculation </param>
/// <returns> the <seealso cref="Daf"/>.
/// </returns>
/// <exception cref="IllegalArgumentException">
/// if the date is prior to the September 11, 1923 start date of the first Daf Yomi cycle </exception>
public static Daf getDafYomiBavli(JewishCalendar calendar)
{
/*
* The number of daf per masechta. Since the number of blatt in Shekalim changed on the 8th Daf Yomi cycle
* beginning on June 24, 1975 from 13 to 22, the actual calculation for blattPerMasechta[4] will later be
* adjusted based on the cycle.
*/
int[] blattPerMasechta = { 64, 157, 105, 121, 22, 88, 56, 40, 35, 31, 32, 29, 27, 122, 112, 91, 66, 49, 90, 82, 119, 119, 176, 113, 24, 49, 76, 14, 120, 110, 142, 61, 34, 34, 28, 22, 4, 10, 4, 73 };
DateTime date = calendar.Time;
Daf dafYomi = null;
int julianDay = getJulianDay(date);
int cycleNo = 0;
int dafNo = 0;
if (date < dafYomiStartDate)
{
// TODO: should we return a null or throw an IllegalArgumentException?
throw new System.ArgumentException(date + " is prior to organized Daf Yomi Bavli cycles that started on " + dafYomiStartDate);
}
if (date.Equals(shekalimChangeDate) || date > shekalimChangeDate)
{
cycleNo = 8 + ((julianDay - shekalimJulianChangeDay) / 2711);
dafNo = ((julianDay - shekalimJulianChangeDay) % 2711);
}
else
{
cycleNo = 1 + ((julianDay - dafYomiJulianStartDay) / 2702);
dafNo = ((julianDay - dafYomiJulianStartDay) % 2702);
}
int total = 0;
int masechta = -1;
int blatt = 0;
/* Fix Shekalim for old cycles. */
if (cycleNo <= 7)
{
blattPerMasechta[4] = 13;
}
else
{
blattPerMasechta[4] = 22; // correct any change that may have been changed from a prior calculation
}
/* Finally find the daf. */
for (int j = 0; j < blattPerMasechta.Length; j++)
{
masechta++;
total = total + blattPerMasechta[j] - 1;
if (dafNo < total)
{
blatt = 1 + blattPerMasechta[j] - (total - dafNo);
/* Fiddle with the weird ones near the end. */
if (masechta == 36)
{
blatt += 21;
}
else if (masechta == 37)
{
blatt += 24;
}
else if (masechta == 38)
{
blatt += 33;
}
dafYomi = new Daf(masechta, blatt);
break;
}
}
return(dafYomi);
}